/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-5644d1e-m
[2020-08-19 06:59:37,476 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-19 06:59:37,479 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-19 06:59:37,516 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-19 06:59:37,516 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-19 06:59:37,525 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-19 06:59:37,527 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-19 06:59:37,530 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-19 06:59:37,532 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-19 06:59:37,535 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-19 06:59:37,536 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-19 06:59:37,536 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-19 06:59:37,537 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-19 06:59:37,539 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-19 06:59:37,541 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-19 06:59:37,543 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-19 06:59:37,544 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-19 06:59:37,545 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-19 06:59:37,546 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-19 06:59:37,554 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-19 06:59:37,556 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-19 06:59:37,556 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-19 06:59:37,557 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-19 06:59:37,558 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-19 06:59:37,569 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-19 06:59:37,570 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-19 06:59:37,570 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-19 06:59:37,571 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-19 06:59:37,571 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-19 06:59:37,574 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-19 06:59:37,574 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-19 06:59:37,575 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-19 06:59:37,575 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-19 06:59:37,576 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-19 06:59:37,577 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-19 06:59:37,577 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-19 06:59:37,578 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-19 06:59:37,578 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-19 06:59:37,578 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-08-19 06:59:37,580 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-19 06:59:37,581 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-19 06:59:37,621 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-19 06:59:37,621 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-19 06:59:37,623 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-19 06:59:37,623 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-19 06:59:37,623 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-19 06:59:37,623 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-19 06:59:37,624 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-19 06:59:37,624 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-19 06:59:37,624 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-19 06:59:37,624 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-19 06:59:37,625 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-19 06:59:37,626 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-19 06:59:37,626 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-19 06:59:37,626 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-19 06:59:37,626 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-19 06:59:37,627 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-19 06:59:37,627 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-19 06:59:37,627 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-19 06:59:37,627 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-19 06:59:37,627 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-19 06:59:37,628 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-19 06:59:37,628 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-19 06:59:37,628 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-19 06:59:37,628 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-19 06:59:37,628 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-19 06:59:37,629 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-19 06:59:37,629 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-19 06:59:37,629 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-19 06:59:37,629 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-19 06:59:37,629 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;
[2020-08-19 06:59:37,937 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-19 06:59:37,950 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-19 06:59:37,953 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-19 06:59:37,954 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-19 06:59:37,954 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-19 06:59:37,954 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-19 06:59:38,011 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f1817aa13/598cb06e24ba4ac2b9aa819b991cd4bd/FLAG8c7c09e7a
[2020-08-19 06:59:38,732 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-19 06:59:38,733 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/seq-mthreaded-reduced/pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-19 06:59:38,765 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f1817aa13/598cb06e24ba4ac2b9aa819b991cd4bd/FLAG8c7c09e7a
[2020-08-19 06:59:38,852 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f1817aa13/598cb06e24ba4ac2b9aa819b991cd4bd
[2020-08-19 06:59:38,860 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-19 06:59:38,862 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-19 06:59:38,863 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-19 06:59:38,863 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-19 06:59:38,866 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-19 06:59:38,867 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:59:38" (1/1) ...
[2020-08-19 06:59:38,870 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a0b5c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:38, skipping insertion in model container
[2020-08-19 06:59:38,870 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:59:38" (1/1) ...
[2020-08-19 06:59:38,877 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-19 06:59:39,051 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-19 06:59:40,515 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-19 06:59:40,528 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-19 06:59:41,612 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-19 06:59:41,635 INFO  L208         MainTranslator]: Completed translation
[2020-08-19 06:59:41,636 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41 WrapperNode
[2020-08-19 06:59:41,636 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-19 06:59:41,637 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-19 06:59:41,637 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-19 06:59:41,637 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-19 06:59:41,650 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,651 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,684 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,685 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,763 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,813 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,834 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
[2020-08-19 06:59:41,856 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-19 06:59:41,857 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-19 06:59:41,857 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-19 06:59:41,857 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-19 06:59:41,858 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-19 06:59:41,938 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-19 06:59:41,939 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-19 06:59:41,939 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-19 06:59:41,939 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-19 06:59:41,940 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-19 06:59:41,940 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char
[2020-08-19 06:59:41,940 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-19 06:59:41,940 INFO  L130     BoogieDeclarations]: Found specification of procedure assert
[2020-08-19 06:59:41,941 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-19 06:59:41,941 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-19 06:59:41,942 INFO  L130     BoogieDeclarations]: Found specification of procedure read
[2020-08-19 06:59:41,942 INFO  L130     BoogieDeclarations]: Found specification of procedure write
[2020-08-19 06:59:41,942 INFO  L130     BoogieDeclarations]: Found specification of procedure node1
[2020-08-19 06:59:41,942 INFO  L130     BoogieDeclarations]: Found specification of procedure node2
[2020-08-19 06:59:41,942 INFO  L130     BoogieDeclarations]: Found specification of procedure node3
[2020-08-19 06:59:41,943 INFO  L130     BoogieDeclarations]: Found specification of procedure node4
[2020-08-19 06:59:41,944 INFO  L130     BoogieDeclarations]: Found specification of procedure node5
[2020-08-19 06:59:41,944 INFO  L130     BoogieDeclarations]: Found specification of procedure init
[2020-08-19 06:59:41,944 INFO  L130     BoogieDeclarations]: Found specification of procedure check
[2020-08-19 06:59:41,944 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-19 06:59:41,944 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-19 06:59:41,945 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-19 06:59:46,020 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-19 06:59:46,020 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-19 06:59:46,033 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:59:46 BoogieIcfgContainer
[2020-08-19 06:59:46,033 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-19 06:59:46,035 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-19 06:59:46,036 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-19 06:59:46,042 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-19 06:59:46,042 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:59:38" (1/3) ...
[2020-08-19 06:59:46,042 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45dc561c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:59:46, skipping insertion in model container
[2020-08-19 06:59:46,042 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:59:41" (2/3) ...
[2020-08-19 06:59:46,043 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@45dc561c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:59:46, skipping insertion in model container
[2020-08-19 06:59:46,043 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:59:46" (3/3) ...
[2020-08-19 06:59:46,045 INFO  L109   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.5.2.ufo.BOUNDED-10.pals.c.v+nlh-reducer.c
[2020-08-19 06:59:46,053 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-19 06:59:46,062 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-19 06:59:46,075 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-19 06:59:46,101 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-19 06:59:46,101 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-19 06:59:46,101 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-19 06:59:46,102 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-19 06:59:46,102 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-19 06:59:46,102 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-19 06:59:46,102 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-19 06:59:46,102 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-19 06:59:46,142 INFO  L276                IsEmpty]: Start isEmpty. Operand 1431 states.
[2020-08-19 06:59:46,189 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 488
[2020-08-19 06:59:46,189 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 06:59:46,190 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 06:59:46,191 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 06:59:46,197 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 06:59:46,197 INFO  L82        PathProgramCache]: Analyzing trace with hash -1961833088, now seen corresponding path program 1 times
[2020-08-19 06:59:46,206 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 06:59:46,206 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101819657]
[2020-08-19 06:59:46,207 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 06:59:48,286 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 06:59:50,418 WARN  L193               SmtUtils]: Spent 1.41 s on a formula simplification that was a NOOP. DAG size: 403
[2020-08-19 06:59:50,420 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 06:59:50,430 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 06:59:50,987 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 06:59:50,988 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101819657]
[2020-08-19 06:59:50,990 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 06:59:50,991 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-08-19 06:59:50,992 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666368085]
[2020-08-19 06:59:51,001 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-08-19 06:59:51,001 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 06:59:51,013 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-08-19 06:59:51,013 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-08-19 06:59:51,015 INFO  L87              Difference]: Start difference. First operand 1431 states. Second operand 5 states.
[2020-08-19 07:00:06,135 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 07:00:06,136 INFO  L93              Difference]: Finished difference Result 4236 states and 7632 transitions.
[2020-08-19 07:00:06,138 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-08-19 07:00:06,139 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 487
[2020-08-19 07:00:06,141 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 07:00:06,187 INFO  L225             Difference]: With dead ends: 4236
[2020-08-19 07:00:06,187 INFO  L226             Difference]: Without dead ends: 2814
[2020-08-19 07:00:06,200 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-08-19 07:00:06,220 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 2814 states.
[2020-08-19 07:00:06,420 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 2814 to 2812.
[2020-08-19 07:00:06,421 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 2812 states.
[2020-08-19 07:00:06,433 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 2812 states to 2812 states and 4639 transitions.
[2020-08-19 07:00:06,435 INFO  L78                 Accepts]: Start accepts. Automaton has 2812 states and 4639 transitions. Word has length 487
[2020-08-19 07:00:06,437 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 07:00:06,437 INFO  L479      AbstractCegarLoop]: Abstraction has 2812 states and 4639 transitions.
[2020-08-19 07:00:06,437 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-08-19 07:00:06,437 INFO  L276                IsEmpty]: Start isEmpty. Operand 2812 states and 4639 transitions.
[2020-08-19 07:00:06,453 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 490
[2020-08-19 07:00:06,453 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 07:00:06,454 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 07:00:06,455 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-19 07:00:06,455 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 07:00:06,455 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 07:00:06,456 INFO  L82        PathProgramCache]: Analyzing trace with hash 39211808, now seen corresponding path program 1 times
[2020-08-19 07:00:06,456 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 07:00:06,456 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1468536228]
[2020-08-19 07:00:06,457 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 07:00:06,635 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 07:00:07,920 WARN  L193               SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 403
[2020-08-19 07:00:07,923 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 07:00:07,949 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 07:00:08,615 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 07:00:08,616 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1468536228]
[2020-08-19 07:00:08,616 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 07:00:08,616 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 07:00:08,617 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12087101]
[2020-08-19 07:00:08,620 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 07:00:08,620 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 07:00:08,621 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 07:00:08,621 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 07:00:08,621 INFO  L87              Difference]: Start difference. First operand 2812 states and 4639 transitions. Second operand 4 states.
[2020-08-19 07:00:26,024 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-19 07:00:26,024 INFO  L93              Difference]: Finished difference Result 8158 states and 13422 transitions.
[2020-08-19 07:00:26,025 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-19 07:00:26,025 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 489
[2020-08-19 07:00:26,027 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-19 07:00:26,054 INFO  L225             Difference]: With dead ends: 8158
[2020-08-19 07:00:26,054 INFO  L226             Difference]: Without dead ends: 5560
[2020-08-19 07:00:26,060 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 07:00:26,068 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 5560 states.
[2020-08-19 07:00:26,237 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 5560 to 5558.
[2020-08-19 07:00:26,238 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 5558 states.
[2020-08-19 07:00:26,259 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 5558 states to 5558 states and 9141 transitions.
[2020-08-19 07:00:26,260 INFO  L78                 Accepts]: Start accepts. Automaton has 5558 states and 9141 transitions. Word has length 489
[2020-08-19 07:00:26,262 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-19 07:00:26,262 INFO  L479      AbstractCegarLoop]: Abstraction has 5558 states and 9141 transitions.
[2020-08-19 07:00:26,263 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-19 07:00:26,263 INFO  L276                IsEmpty]: Start isEmpty. Operand 5558 states and 9141 transitions.
[2020-08-19 07:00:26,278 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 491
[2020-08-19 07:00:26,278 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-19 07:00:26,279 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-19 07:00:26,283 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-19 07:00:26,284 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-19 07:00:26,285 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-19 07:00:26,285 INFO  L82        PathProgramCache]: Analyzing trace with hash -960654715, now seen corresponding path program 1 times
[2020-08-19 07:00:26,285 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-19 07:00:26,287 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325961880]
[2020-08-19 07:00:26,287 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-19 07:00:26,355 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 07:00:27,317 WARN  L193               SmtUtils]: Spent 813.00 ms on a formula simplification that was a NOOP. DAG size: 403
[2020-08-19 07:00:27,318 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-19 07:00:27,324 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-19 07:00:27,490 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-19 07:00:27,491 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325961880]
[2020-08-19 07:00:27,491 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-19 07:00:27,491 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-19 07:00:27,491 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482156698]
[2020-08-19 07:00:27,492 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-19 07:00:27,493 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-19 07:00:27,493 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-19 07:00:27,493 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-19 07:00:27,494 INFO  L87              Difference]: Start difference. First operand 5558 states and 9141 transitions. Second operand 4 states.